231749857 has 4 divisors (see below), whose sum is σ = 232381696. Its totient is φ = 231118020.

The previous prime is 231749839. The next prime is 231749879. The reversal of 231749857 is 758947132.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 231749857 - 2¹¹ = 231747809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231749887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 315369 + ... + 316102.

It is an arithmetic number, because the mean of its divisors is an integer number (58095424).

Almost surely, 2^231749857 is an apocalyptic number.

It is an amenable number.

231749857 is a deficient number, since it is larger than the sum of its proper divisors (631839).

231749857 is an equidigital number, since it uses as much as digits as its factorization.

231749857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 631838.

The product of its digits is 423360, while the sum is 46.

The square root of 231749857 is about 15223.3326509014. The cubic root of 231749857 is about 614.2424470568.

The spelling of 231749857 in words is "two hundred thirty-one million, seven hundred forty-nine thousand, eight hundred fifty-seven".